A registry of federally and privately supported clinical trials conducted in the United States and around the world. Clinical Trials gives you information about a trial's purpose, who may participate, locations, and phone numbers for more details.
The Medicare Rights Center is a nonprofit consumer service organization that works to ensure access to affordable health care for older adults and people with disabilities through counseling and advocacy, educational programs and public policy initiatives.
Medline Plus is a good place to start when you need answers. It is a gold mine of good health information from the world's largest medical library, the National Library of Medicine.
WebMD is one of the best sites for general consumer information on health-related issues and advice.